Optimal trapping wavelengths of Cs 2 molecules in an optical lattice Journal Article

Author(s): Vexiau, Romain; Bouloufa, Nadia; Aymar, Mireille; Danzl, Johannes G; Mark, Manfred J; Nägerl, Hanns C; Dulieu, Olivier
Article Title: Optimal trapping wavelengths of Cs 2 molecules in an optical lattice
Abstract: The present paper aims at finding optimal parameters for trapping of Cs 2 molecules in optical lattices, with the perspective of creating a quantum degenerate gas of ground-state molecules. We have calculated dynamic polarizabilities of Cs 2 molecules subject to an oscillating electric field, using accurate potential curves and electronic transition dipole moments. We show that for some particular wavelengths of the optical lattice, called "magic wavelengths", the polarizability of the ground-state molecules is equal to the one of a Feshbach molecule. As the creation of the sample of ground-state molecules relies on an adiabatic population transfer from weakly-bound molecules created on a Feshbach resonance, such a coincidence ensures that both the initial and final states are favorably trapped by the lattice light, allowing optimized transfer in agreement with the experimental observation.
Journal Title: European Physical Journal D
Volume: 65
Issue 1-2
ISSN: 1434-6060
Publisher: Springer  
Date Published: 2011-11-01
Start Page: 243
End Page: 250
DOI: 10.1140/epjd/e2011-20085-4
Notes: We thank E. Haller for important contributions to the experimental work and R. Grimm for generous support. We acknowledge funding by the Austrian Science Fund (FWF) within project Quantum Gases of Ground-State Molecules, project number P 21555-N20.
Open access: yes (repository)